More expensive airfares seem probable, especially when you consider that demand is projected to explode over the next two decades. The International Air Transport Association (IATA) predicts that the number of people taking to the skies will double by 2035. In that year, the trade association expects more than 7 billion passengers to fly on commercial airlines.
Recent trends and the ways that airlines have reacted to market conditions in the past suggest that fares might actually stay the same (or even get cheaper).
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